[Feature] No-Intro Dat-o-Matic integration

[IngwiePhoenix]

Is your feature request related to a problem? Please describe.
Be it bitrot or just plain unsureness; but it would be very helpful to see and know if a ROM has been verified. I do this manually sometimes with 7zip's fingerprinting tool but it'd be very useful to have this built into the library itself, allowing one to either search for, filter by, or see it on a relevant ROMs' page if the hash is known in the No-Intro DBs.

General downloads: https://datomatic.no-intro.org/index.php?page=download&s=64
Their wiki: https://wiki.no-intro.org/index.php?title=Main_Page

Describe the solution you'd like
Download - or accept - database files from no-intro and generate hashes while scanning the library (sha1, md5 and crc32 seem to be the most common). Those, plus the origin system, can then be used to look up the relevant data.

Describe alternatives you've considered
Allow the user to search for a ROM by it's hash in their database. I didn't look much into their form, but i wouldn't be surprised if it was relatively simple.

Additional context
In the ToDo's stated in their Wiki, they were considering a more ad-hock API. However, it might be sufficient to just use locally stored databases instead; plus, less requests sent to the website itself. :)

[zurdi15]

related to #102